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Vishay General Semiconductor - Diodes Division SMBJ24AHM3_B/I
- Part No.:
- SMBJ24AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24AHM3_B/I.pdf
- Description:
- 600W,24V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,171
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Product details
Overview
SMBJ24AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 38.9 V maximum clamping voltage (VC) at 15.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ24AHM3_B/I datasheet, SMBJ24AHM3_B/I pinout, SMBJ24AHM3_B/I application, or SMBJ24AHM3_B/I equivalent, this device is selected for high-reliability surge suppression in automotive-grade industrial power supplies, sensor interface circuits, and 24 V control bus protection where halogen-free, AEC-Q101-qualified components are required.
Technical Context
This TVS diode operates as a unidirectional clamping device, conducting only in reverse bias above VBR to limit transient voltages to ≤38.9 V at 15.4 A. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 24 V), while its MSL Level 1 rating supports lead-free reflow up to 260 °C.
The SMBJ24AHM3_B/I is part of Vishay's HM3 automotive-qualified series - halogen-free, RoHS-compliant, and AEC-Q101 certified - with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W, enabling effective heat dissipation on standard PCB copper pads (0.2" × 0.2").
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering without premature conduction. |
| VC @ IPPM | 38.9 V at 15.4 A - Clamping voltage under 10/1000 µs surge defines worst-case protected node voltage during ESD or load dump. |
| PPPM | 600 W - Peak pulse power handling capability determines survivability against IEC 61000-4-5 Level 4 surges (e.g., 4 kV line-to-ground). |
| IPPM | 15.4 A - Peak pulse current rating directly maps to surge energy absorption (W × s) for system-level transient immunity validation. |
| Junction Temp Range | −55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor power electronics. |
| Leakage Current | ≤1.0 µA at VWM - Ensures negligible standby power loss and no interference with high-impedance sensor bias networks. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-biased in protection mode) | Connected to protected circuit ground or low-side return path; forms clamping loop with cathode. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V supply rail); conducts surge current to ground when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains with full temperature and life-cycle stress testing. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing and end-of-life compliance. |
| 600 W peak pulse power (10/1000 µs) | Withstands repeated 4 kV/2 Ω IEC 61000-4-5 surges without degradation when mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during transients, protecting downstream MOSFETs, MCUs, and CAN transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 24 V battery-supplied ECUs exposed to load-dump transients (ISO 16750-2, up to 35 V/100 ms) and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input to clamp surges before regulation stage. Use Value: Limits voltage to ≤38.9 V during 15.4 A transients, preventing damage to 40 V-rated input MOSFETs and maintaining system uptime. |
Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed across noisy factory floors with inductive switching noise. IC Role / Device Role / Timing Role: TVS placed at sensor connector entry point, shunting EFT bursts (IEC 61000-4-4, 4 kV) to chassis ground. Use Value: Sub-1 ns response time and <1 µA leakage preserve signal integrity and offset accuracy in 16-bit ADC front-ends. |
| PLC Digital I/O Protection | 24 V Control Bus Surge Suppression |
|
Use Scenario: Discrete 24 V digital inputs on programmable logic controllers subjected to relay coil flyback and field wiring faults. IC Role / Device Role / Timing Role: SMBJ24AHM3_B/I installed per-channel at terminal block entry, referenced to common I/O ground plane. Use Value: 600 W rating absorbs repetitive 100 A/10 ms surges from inductive loads without parameter drift or failure. |
Use Scenario: CAN or RS-485 communication buses powered from shared 24 V supply, vulnerable to ground bounce and lightning-induced surges. IC Role / Device Role / Timing Role: TVS deployed on VCC line upstream of bus transceivers to prevent supply rail collapse during coupled transients. Use Value: 24 V VWM aligns with nominal bus voltage; clamping at 38.9 V avoids brownout of 3.3 V LDOs powering transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24AHE3_B/I | Same electrical specs, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard SnPb-compatible plating. | Lacks automotive qualification; suitable for non-automotive industrial or consumer equipment with lower reliability requirements. | Select when AEC-Q101 is not mandated and cost optimization is prioritized over automotive traceability. |
| SMAJ24A-HF | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC ratings. | Reduced surge margin; limited to lower-energy threats (e.g., IEC 61000-4-2 ESD only) and space-constrained layouts. | Choose only if board area is critical and surge threat level is confirmed ≤400 W; verify thermal derating at elevated ambient. |
Compared with SMBJ24AHM3_B/I, the HE3 variant trades automotive qualification for broader commercial availability, while the SMAJ24A-HF sacrifices 33 % peak power and thermal performance for smaller size - making SMBJ24AHM3_B/I the optimal choice for AEC-Q101-mandated, high-energy 24 V rail protection.
Availability
SMBJ24AHM3_B/I is available at Aetrix Electronics and suitable for automotive control modules, industrial PLC I/O cards, and 24 V sensor interface designs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMBJ24AHM3_B/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series targets high-surge industrial and automotive power protection, engineered to meet stringent ISO 16750, IEC 61000-4-5, and AEC-Q101 requirements for mission-critical voltage clamping.
FAQ
What is the clamping voltage of SMBJ24AHM3_B/I at its rated peak pulse current?
The SMBJ24AHM3_B/I has a maximum clamping voltage (VC) of 38.9 V at its rated peak pulse current (IPPM) of 15.4 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is verified per ANSI/IEEE C62.35. The SMBJ24AHM3_B/I maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMBJ24AHM3_B/I suitable for automotive applications?
Yes, SMBJ24AHM3_B/I is AEC-Q101 qualified and specifically designed for automotive use. Its HM3 suffix denotes halogen-free, RoHS-compliant construction with full stress testing per AEC-Q101 Rev H, including temperature cycling, humidity bias, and high-temperature operating life. The SMBJ24AHM3_B/I is deployed in engine control units, body electronics, and ADAS power domains where sustained operation at 150 °C junction temperature and immunity to load-dump transients are mandatory.
How does the SMBJ24AHM3_B/I differ from the SMBJ24A-E3/52 variant?
The SMBJ24AHM3_B/I differs from SMBJ24A-E3/52 in three key aspects: it is halogen-free (HM3 vs. E3), AEC-Q101 qualified (vs. commercial-grade E3), and supplied in 13" tape-and-reel (I-packaging code) versus 7" reel (52 code). Electrically, both share identical VWM, VBR, VC, and PPPM specifications. The SMBJ24AHM3_B/I is intended for automotive and high-reliability industrial applications where material compliance and qualification evidence are contractually required.
What is the thermal resistance of SMBJ24AHM3_B/I, and how does it affect PCB layout?
The SMBJ24AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surge conditions, PCB layout must allocate adequate copper area and avoid thermal isolation. For continuous 5.0 W power dissipation, ambient temperature must remain below 100 °C - confirming that SMBJ24AHM3_B/I is optimized for transient, not steady-state, power handling.
Can SMBJ24AHM3_B/I be used in bidirectional protection circuits?
No, SMBJ24AHM3_B/I is a unidirectional TVS diode and is not suitable for bidirectional protection. Its cathode-band marking and asymmetric IV curve allow conduction only in reverse bias - essential for DC rail protection but ineffective against AC or symmetrical transients. For bidirectional applications (e.g., data lines, AC inputs), Vishay specifies parts with "CA" suffix such as SMBJ24CA. Using SMBJ24AHM3_B/I in place of a bidirectional device would leave positive-going transients unclamped, risking system failure.
SMBJ24AHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ24AHM3_B/I FAQ
1.How can I place an order for SMBJ24AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24AHM3_B/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ24AHM3_B/I reliable?
The price and inventory of SMBJ24AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ24AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24AHM3_B/I?
SMBJ24AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24AHM3_B/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ24AHM3_B/I?
For technical support, including SMBJ24AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ24AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ24AHM3_B/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ24AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ24AHM3_B/I?
All SMBJ24AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24AHM3_B/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ24AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ24AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24AHM3_B/I Tags
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